User talk:Dalf/sandbox1

Dimminsions of the Drak Equation: $${stars \over year \times galexy} \times {plantes \over star} \times {habital planets \over planets } \times {life \over habitable planets} \times {inteligent life \over life} \times {communicating life \over inteligent life} \times years$$

Or you can do one manually if you need only a segment of the board: